POWER STEERING SYSTEM, Diagnostic DTC:C1524 and C1555

DTC Code DTC Name
C1524 Motor Terminal Voltage
C1555 Motor Relay Welding Failure

DESCRIPTION

The power steering ECU assembly supplies current to the power steering motor assembly (steering column assembly) through the motor circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Return-to-normal Condition

Note

C1524

Motor Terminal Voltage

Short (or open) in motor circuit or abnormal voltage in motor circuit

  • Power steering motor assembly (Steering column assembly)

  • Power steering ECU assembly

EPS warning light: Comes on

Ignition switch ON again

-

C1555

Motor Relay Welding Failure

Predriver (Motor relay circuit) malfunction

  • Power steering motor assembly (Steering column assembly)

  • Power steering ECU assembly

EPS warning light: Comes on

Ignition switch ON again

-

WIRING DIAGRAM

C250218E14

CAUTION / NOTICE / HINT

Note:

If the power steering ECU assembly has been replaced, perform assist map writing and torque sensor zero point calibration.

Click here

PROCEDURE

  1. CHECK POWER STEERING ECU ASSEMBLY

    1. Start the engine.

    2. C240098C09

      *a

      Component with harness connected

      (Power Steering ECU Assembly)

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      z5-1 (M1) - Body ground

      Engine running and steering wheel being turned to left

      6 to 8 V

      z5-1 (M1) - Body ground

      Engine running and steering wheel being turned to right

      9 to 16 V

      z5-2 (M2) - Body ground

      Engine running and steering wheel being turned to left

      9 to 16 V

      z5-2 (M2) - Body ground

      Engine running and steering wheel being turned to right

      6 to 8 V

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE POWER STEERING ECU ASSEMBLY

    Click here

    OK

  2. INSPECT POWER STEERING MOTOR ASSEMBLY (STEERING COLUMN ASSEMBLY)

    1. Disconnect the z5 power steering ECU assembly connector.

    2. C250545C07

      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      z5-1 (M1) - z5-2 (M2)

      Always

      0.1 to 1.0 Ω

      z5-1 (M1) or z5-2 (M2) - Body ground

      Always

      1 MΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE POWER STEERING ECU ASSEMBLY

    Click here

    NG

    REPLACE STEERING COLUMN ASSEMBLY

    Click here